// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()

// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
    const db=cloud.database()
    const c=db.command
    const collection=db.collection(event.collectionName)
    await collection.where({_openid:wxContext.OPENID}).update({
      data:{
        "num":c.inc(1)
      }
    })
  return {
    event,
    openid: wxContext.OPENID,
    appid: wxContext.APPID,
    unionid: wxContext.UNIONID,
  }
}